BDPlugins

The Site Under Construction plugin allows you to quickly put your WordPress site into maintenance mode. When enabled, visitors will see a customizable “Site Under Construction” message, while administrators can continue to view and work on the site as usual.
Features: 
– Enable or disable the “Site Under Construction” mode with a checkbox. 
– Customize the message displayed to visitors. 
– Seamlessly integrates with the WordPress General Settings page.

Site Under Construction

A simple plugin to display a "Site Under Construction" page to visitors while administrators can view the site.

kulchan pvt. ltd

kaushal dip subba

This plugin allow WordPress site administrator close the website for maintenance. It can be also used as coming soon page for new website. 
However Logged in user can view the frontend. It contain easy customization admin panel and is responsive for mobile devices.
<h4>Features</h4>
<pre><code>* Fully customizable (change colors, texts);
* Visual Editor to change the Main Content
* Contact Form (Email template);
* Responsive design;
* Full Screen Slider;
* Upload own logo;
* Add your title, headline, text;
* Configurable colors: fonts, icons, background;
* Social media icons;
</code></pre>

Kul Maintenance

Simple and Easy Maintenance mode with slider, contact form with Responsive layout. Can be also used as coming soon template.

Site Under Construction vs Kul Maintenance